Or like this:
d = data.frame(gender=c("m","f","unkown"), x=rnorm(300))
ddply(d,"gender",summarise,mean=mean(x))
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA
--- On Thu, 12/10/09, smu <[email protected]> wrote:
> From: smu <[email protected]>
> Subject: Re: [R] simple data manipulation question
> To: "dolar" <[email protected]>
> Cc: [email protected]
> Date: Thursday, December 10, 2009, 1:45 AM
> for example:
>
> > d = data.frame(gender=c("m","f","unkown"),
> x=rnorm(300))
> > tapply(d$x,d$gender,mean)
> f
> m
> unkown
> 0.0787628409 0.0940534765 -0.0005323276
>
> regards,
> stefan
>
>
> On Wed, Dec 09, 2009 at 04:50:37PM -0800, dolar wrote:
> >
> > Hi there
> >
> > I have a dataframe of a whole lot of variables
> >
> > lets say, one of my variables is gender
> > how do I simply get an average of all other variables
> by gender?
> > --
> > View this message in context:
> > http://n4.nabble.com/simple-data-manipulation-question-tp956600p956600.html
> > Sent from the R help mailing list archive at
> Nabble.com.
> >
> > ______________________________________________
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> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained,
> reproducible code.
> >
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
>
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